A St. Louis scientist who was among a select group picked by the Obama administration to pursue a solution to the oil spill in the Gulf of Mexico has been removed from the group because of writings on his website, the U.S. Energy Department confirmed Wednesday.

Washington University physics professor Jonathan Katz was one of five top scientists chosen by the Department of Energy and attended meetings in Houston last week.

Though considered a leading scientist, Katz’s website postings often touch on social issues. Some of those writings have stirred anger in the past and include postings defending homophobia and questioning the value of racial diversity efforts.